skip empty pin list value

src/Controller/ModuleController.php

@@ -102,9 +102,12 @@ class ModuleController extends AbstractController
         // Create rooms list
         $list = [];
 
-        foreach ((array) explode('|', $this->getParameter('app.kevacoin.room.namespaces.pinned')) as $room)
+        if ($this->getParameter('app.kevacoin.room.namespaces.pinned'))
         {
-            $list[] = $room;
+            foreach ((array) explode('|', $this->getParameter('app.kevacoin.room.namespaces.pinned')) as $room)
+            {
+                $list[] = $room;
+            }
         }
 
         // Append custom valid namespace to the rooms list menu